Enquiry on HP Procurve Switches

Greetings,

My company currently are using HP 8212, 5412, 3500, 2600 and 2500 series switches. I do also using PCM software to manage all the swithces. My problem is, all the switches detected by PCM will be automatically display in their repective model folders(eg: 8212 switch will be placed in 8200 folder) except the 2500 series switches will be placed in a folder name "ProCurve Others". Can anybody tell why it not placed in 2500 folder? I do compare my 2500 switch config with 3500 switch config, it seem like nothing difference in the configuration.